Adding upstream version 1:115.7.0.upstream/1%115.7.0upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 360 insertions, 0 deletions

diff --git a/gfx/2d/HelpersSkia.h b/gfx/2d/HelpersSkia.h
new file mode 100644
index 0000000000..7f7bf6fbc1
--- /dev/null
+++ b/gfx/2d/HelpersSkia.h
@@ -0,0 +1,360 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef MOZILLA_GFX_HELPERSSKIA_H_
+#define MOZILLA_GFX_HELPERSSKIA_H_
+
+#include "2D.h"
+#include "skia/include/core/SkCanvas.h"
+#include "skia/include/core/SkPathEffect.h"
+#include "skia/include/core/SkPathTypes.h"
+#include "skia/include/core/SkShader.h"
+#include "skia/include/effects/SkDashPathEffect.h"
+#include "mozilla/Assertions.h"
+#include <cmath>
+#include <vector>
+#include "nsDebug.h"
+
+namespace mozilla {
+namespace gfx {
+
+static inline SkColorType GfxFormatToSkiaColorType(SurfaceFormat format) {
+  switch (format) {
+    case SurfaceFormat::B8G8R8A8:
+      return kBGRA_8888_SkColorType;
+    case SurfaceFormat::B8G8R8X8:
+      // We probably need to do something here.
+      return kBGRA_8888_SkColorType;
+    case SurfaceFormat::R5G6B5_UINT16:
+      return kRGB_565_SkColorType;
+    case SurfaceFormat::A8:
+      return kAlpha_8_SkColorType;
+    case SurfaceFormat::R8G8B8A8:
+      return kRGBA_8888_SkColorType;
+    case SurfaceFormat::A8R8G8B8:
+      MOZ_DIAGNOSTIC_ASSERT(false, "A8R8G8B8 unsupported by Skia");
+      return kRGBA_8888_SkColorType;
+    default:
+      MOZ_DIAGNOSTIC_ASSERT(false, "Unknown surface format");
+      return kRGBA_8888_SkColorType;
+  }
+}
+
+static inline SurfaceFormat SkiaColorTypeToGfxFormat(
+    SkColorType aColorType, SkAlphaType aAlphaType = kPremul_SkAlphaType) {
+  switch (aColorType) {
+    case kBGRA_8888_SkColorType:
+      return aAlphaType == kOpaque_SkAlphaType ? SurfaceFormat::B8G8R8X8
+                                               : SurfaceFormat::B8G8R8A8;
+    case kRGB_565_SkColorType:
+      return SurfaceFormat::R5G6B5_UINT16;
+    case kAlpha_8_SkColorType:
+      return SurfaceFormat::A8;
+    default:
+      return SurfaceFormat::B8G8R8A8;
+  }
+}
+
+static inline SkAlphaType GfxFormatToSkiaAlphaType(SurfaceFormat format) {
+  switch (format) {
+    case SurfaceFormat::B8G8R8X8:
+    case SurfaceFormat::R5G6B5_UINT16:
+      return kOpaque_SkAlphaType;
+    default:
+      return kPremul_SkAlphaType;
+  }
+}
+
+static inline SkImageInfo MakeSkiaImageInfo(const IntSize& aSize,
+                                            SurfaceFormat aFormat) {
+  return SkImageInfo::Make(aSize.width, aSize.height,
+                           GfxFormatToSkiaColorType(aFormat),
+                           GfxFormatToSkiaAlphaType(aFormat));
+}
+
+static inline void GfxMatrixToSkiaMatrix(const Matrix& mat, SkMatrix& retval) {
+  retval.setAll(SkFloatToScalar(mat._11), SkFloatToScalar(mat._21),
+                SkFloatToScalar(mat._31), SkFloatToScalar(mat._12),
+                SkFloatToScalar(mat._22), SkFloatToScalar(mat._32), 0, 0,
+                SK_Scalar1);
+}
+
+static inline void GfxMatrixToSkiaMatrix(const Matrix4x4& aMatrix,
+                                         SkMatrix& aResult) {
+  aResult.setAll(SkFloatToScalar(aMatrix._11), SkFloatToScalar(aMatrix._21),
+                 SkFloatToScalar(aMatrix._41), SkFloatToScalar(aMatrix._12),
+                 SkFloatToScalar(aMatrix._22), SkFloatToScalar(aMatrix._42),
+                 SkFloatToScalar(aMatrix._14), SkFloatToScalar(aMatrix._24),
+                 SkFloatToScalar(aMatrix._44));
+}
+
+static inline SkPaint::Cap CapStyleToSkiaCap(CapStyle aCap) {
+  switch (aCap) {
+    case CapStyle::BUTT:
+      return SkPaint::kButt_Cap;
+    case CapStyle::ROUND:
+      return SkPaint::kRound_Cap;
+    case CapStyle::SQUARE:
+      return SkPaint::kSquare_Cap;
+  }
+  return SkPaint::kDefault_Cap;
+}
+
+static inline SkPaint::Join JoinStyleToSkiaJoin(JoinStyle aJoin) {
+  switch (aJoin) {
+    case JoinStyle::BEVEL:
+      return SkPaint::kBevel_Join;
+    case JoinStyle::ROUND:
+      return SkPaint::kRound_Join;
+    case JoinStyle::MITER:
+    case JoinStyle::MITER_OR_BEVEL:
+      return SkPaint::kMiter_Join;
+  }
+  return SkPaint::kDefault_Join;
+}
+
+static inline bool StrokeOptionsToPaint(SkPaint& aPaint,
+                                        const StrokeOptions& aOptions,
+                                        bool aUsePathEffects = true) {
+  // Skia renders 0 width strokes with a width of 1 (and in black),
+  // so we should just skip the draw call entirely.
+  // Skia does not handle non-finite line widths.
+  if (!aOptions.mLineWidth || !std::isfinite(aOptions.mLineWidth)) {
+    return false;
+  }
+  aPaint.setStrokeWidth(SkFloatToScalar(aOptions.mLineWidth));
+  aPaint.setStrokeMiter(SkFloatToScalar(aOptions.mMiterLimit));
+  aPaint.setStrokeCap(CapStyleToSkiaCap(aOptions.mLineCap));
+  aPaint.setStrokeJoin(JoinStyleToSkiaJoin(aOptions.mLineJoin));
+
+  if (aOptions.mDashLength > 0 && aUsePathEffects) {
+    // Skia only supports dash arrays that are multiples of 2.
+    uint32_t dashCount;
+
+    if (aOptions.mDashLength % 2 == 0) {
+      dashCount = aOptions.mDashLength;
+    } else {
+      dashCount = aOptions.mDashLength * 2;
+    }
+
+    std::vector<SkScalar> pattern;
+    pattern.resize(dashCount);
+
+    for (uint32_t i = 0; i < dashCount; i++) {
+      pattern[i] =
+          SkFloatToScalar(aOptions.mDashPattern[i % aOptions.mDashLength]);
+    }
+
+    auto dash = SkDashPathEffect::Make(&pattern.front(), dashCount,
+                                       SkFloatToScalar(aOptions.mDashOffset));
+    aPaint.setPathEffect(dash);
+  }
+
+  aPaint.setStyle(SkPaint::kStroke_Style);
+  return true;
+}
+
+static inline SkBlendMode GfxOpToSkiaOp(CompositionOp op) {
+  switch (op) {
+    case CompositionOp::OP_CLEAR:
+      return SkBlendMode::kClear;
+    case CompositionOp::OP_OVER:
+      return SkBlendMode::kSrcOver;
+    case CompositionOp::OP_ADD:
+      return SkBlendMode::kPlus;
+    case CompositionOp::OP_ATOP:
+      return SkBlendMode::kSrcATop;
+    case CompositionOp::OP_OUT:
+      return SkBlendMode::kSrcOut;
+    case CompositionOp::OP_IN:
+      return SkBlendMode::kSrcIn;
+    case CompositionOp::OP_SOURCE:
+      return SkBlendMode::kSrc;
+    case CompositionOp::OP_DEST_IN:
+      return SkBlendMode::kDstIn;
+    case CompositionOp::OP_DEST_OUT:
+      return SkBlendMode::kDstOut;
+    case CompositionOp::OP_DEST_OVER:
+      return SkBlendMode::kDstOver;
+    case CompositionOp::OP_DEST_ATOP:
+      return SkBlendMode::kDstATop;
+    case CompositionOp::OP_XOR:
+      return SkBlendMode::kXor;
+    case CompositionOp::OP_MULTIPLY:
+      return SkBlendMode::kMultiply;
+    case CompositionOp::OP_SCREEN:
+      return SkBlendMode::kScreen;
+    case CompositionOp::OP_OVERLAY:
+      return SkBlendMode::kOverlay;
+    case CompositionOp::OP_DARKEN:
+      return SkBlendMode::kDarken;
+    case CompositionOp::OP_LIGHTEN:
+      return SkBlendMode::kLighten;
+    case CompositionOp::OP_COLOR_DODGE:
+      return SkBlendMode::kColorDodge;
+    case CompositionOp::OP_COLOR_BURN:
+      return SkBlendMode::kColorBurn;
+    case CompositionOp::OP_HARD_LIGHT:
+      return SkBlendMode::kHardLight;
+    case CompositionOp::OP_SOFT_LIGHT:
+      return SkBlendMode::kSoftLight;
+    case CompositionOp::OP_DIFFERENCE:
+      return SkBlendMode::kDifference;
+    case CompositionOp::OP_EXCLUSION:
+      return SkBlendMode::kExclusion;
+    case CompositionOp::OP_HUE:
+      return SkBlendMode::kHue;
+    case CompositionOp::OP_SATURATION:
+      return SkBlendMode::kSaturation;
+    case CompositionOp::OP_COLOR:
+      return SkBlendMode::kColor;
+    case CompositionOp::OP_LUMINOSITY:
+      return SkBlendMode::kLuminosity;
+    case CompositionOp::OP_COUNT:
+      break;
+  }
+
+  return SkBlendMode::kSrcOver;
+}
+
+/* There's quite a bit of inconsistency about
+ * whether float colors should be rounded with .5f.
+ * We choose to do it to match cairo which also
+ * happens to match the Direct3D specs */
+static inline U8CPU ColorFloatToByte(Float color) {
+  // XXX: do a better job converting to int
+  return U8CPU(color * 255.f + .5f);
+};
+
+static inline SkColor ColorToSkColor(const DeviceColor& color, Float aAlpha) {
+  return SkColorSetARGB(ColorFloatToByte(color.a * aAlpha),
+                        ColorFloatToByte(color.r), ColorFloatToByte(color.g),
+                        ColorFloatToByte(color.b));
+}
+
+static inline SkPoint PointToSkPoint(const Point& aPoint) {
+  return SkPoint::Make(SkFloatToScalar(aPoint.x), SkFloatToScalar(aPoint.y));
+}
+
+static inline SkRect RectToSkRect(const Rect& aRect) {
+  return SkRect::MakeXYWH(
+      SkFloatToScalar(aRect.X()), SkFloatToScalar(aRect.Y()),
+      SkFloatToScalar(aRect.Width()), SkFloatToScalar(aRect.Height()));
+}
+
+static inline SkRect IntRectToSkRect(const IntRect& aRect) {
+  return SkRect::MakeXYWH(SkIntToScalar(aRect.X()), SkIntToScalar(aRect.Y()),
+                          SkIntToScalar(aRect.Width()),
+                          SkIntToScalar(aRect.Height()));
+}
+
+static inline SkIRect RectToSkIRect(const Rect& aRect) {
+  return SkIRect::MakeXYWH(int32_t(aRect.X()), int32_t(aRect.Y()),
+                           int32_t(aRect.Width()), int32_t(aRect.Height()));
+}
+
+static inline SkIRect IntRectToSkIRect(const IntRect& aRect) {
+  return SkIRect::MakeXYWH(aRect.X(), aRect.Y(), aRect.Width(), aRect.Height());
+}
+
+static inline IntRect SkIRectToIntRect(const SkIRect& aRect) {
+  return IntRect(aRect.x(), aRect.y(), aRect.width(), aRect.height());
+}
+
+static inline Point SkPointToPoint(const SkPoint& aPoint) {
+  return Point(SkScalarToFloat(aPoint.x()), SkScalarToFloat(aPoint.y()));
+}
+
+static inline Rect SkRectToRect(const SkRect& aRect) {
+  return Rect(SkScalarToFloat(aRect.x()), SkScalarToFloat(aRect.y()),
+              SkScalarToFloat(aRect.width()), SkScalarToFloat(aRect.height()));
+}
+
+static inline SkTileMode ExtendModeToTileMode(ExtendMode aMode, Axis aAxis) {
+  switch (aMode) {
+    case ExtendMode::CLAMP:
+      return SkTileMode::kClamp;
+    case ExtendMode::REPEAT:
+      return SkTileMode::kRepeat;
+    case ExtendMode::REFLECT:
+      return SkTileMode::kMirror;
+    case ExtendMode::REPEAT_X: {
+      return aAxis == Axis::X_AXIS ? SkTileMode::kRepeat : SkTileMode::kClamp;
+    }
+    case ExtendMode::REPEAT_Y: {
+      return aAxis == Axis::Y_AXIS ? SkTileMode::kRepeat : SkTileMode::kClamp;
+    }
+  }
+  return SkTileMode::kClamp;
+}
+
+static inline SkFontHinting GfxHintingToSkiaHinting(FontHinting aHinting) {
+  switch (aHinting) {
+    case FontHinting::NONE:
+      return SkFontHinting::kNone;
+    case FontHinting::LIGHT:
+      return SkFontHinting::kSlight;
+    case FontHinting::NORMAL:
+      return SkFontHinting::kNormal;
+    case FontHinting::FULL:
+      return SkFontHinting::kFull;
+  }
+  return SkFontHinting::kNormal;
+}
+
+static inline FillRule GetFillRule(SkPathFillType aFillType) {
+  switch (aFillType) {
+    case SkPathFillType::kWinding:
+      return FillRule::FILL_WINDING;
+    case SkPathFillType::kEvenOdd:
+      return FillRule::FILL_EVEN_ODD;
+    case SkPathFillType::kInverseWinding:
+    case SkPathFillType::kInverseEvenOdd:
+    default:
+      NS_WARNING("Unsupported fill type\n");
+      break;
+  }
+
+  return FillRule::FILL_EVEN_ODD;
+}
+
+/**
+ * Returns true if the canvas is backed by pixels.  Returns false if the canvas
+ * wraps an SkPDFDocument, for example.
+ *
+ * Note: It is not clear whether the test used to implement this function may
+ * result in it returning false in some circumstances even when the canvas
+ * _is_ pixel backed.  In other words maybe it is possible for such a canvas to
+ * have kUnknown_SkPixelGeometry?
+ */
+static inline bool IsBackedByPixels(const SkCanvas* aCanvas) {
+  SkSurfaceProps props(0, kUnknown_SkPixelGeometry);
+  if (!aCanvas->getProps(&props) ||
+      props.pixelGeometry() == kUnknown_SkPixelGeometry) {
+    return false;
+  }
+  return true;
+}
+
+/**
+ * Computes appropriate resolution scale to be used with SkPath::getFillPath
+ * based on the scaling of the supplied transform.
+ */
+float ComputeResScaleForStroking(const Matrix& aTransform);
+
+/**
+ * This is a wrapper around SkGeometry's SkConic that can be used to convert
+ * conic sections in an SkPath to a sequence of quadratic curves. The quads
+ * vector is organized such that for the Nth quad, it's control points are
+ * 2*N, 2*N+1, 2*N+2. This function returns the resulting number of quads.
+ */
+int ConvertConicToQuads(const Point& aP0, const Point& aP1, const Point& aP2,
+                        float aWeight, std::vector<Point>& aQuads);
+
+}  // namespace gfx
+}  // namespace mozilla
+
+#endif /* MOZILLA_GFX_HELPERSSKIA_H_ */